AL 3 (BH 261)

Globular Cluster AL 3 (BH 261), in Sagittarius

Distance from Sun:
21.2 kly
Distance from Galactic Center:
5.5 kly
Apparent Diameter:
1.3 arc min
11.00 mag vis
Radial Velocity:
+/- km/s
Abs. Mag:
-4.19 Mag vis
Discovered by Andrews and Lindsay (1967), cataloged by Van den Bergh and Hagen (1975), identified as globular cluster by Ortolani, Bica and Barbuy (2005).

AL3 (Andrews-Lindsay 3) was discovered in 1967 by Andrews and Lindsay (1967); it was later cataloged by Van den Bergh and Hagen (1975) as BH 261 or vdB-Ha 261, and as ESO 456-SC78 by Lauberts (1982).

While all these authors listed it as a faint open cluster candidate, investigations by Ortholani (2006) have revealed its nature as a globular cluster by means of spectrophotometric observations, i.e. photometry in B, V, and I band of the spectrum, and Color-Magnitude Diagram. That diagram resembles that of globular cluster M5 and exhibits a prominent blue extended Horizontal Branch. These observations were performed at ESO (La Silla)


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Hartmut Frommert [contact]